Hierarchy classification:

1. top of the aat hierarchies
2. Physical Attributes Facet
3. Color (hierarchy name)
4. colors (hues or tints)
5. chromatic colors
6. blue colors
7. variable blue colors

Anotations

Scope note:

Various colors ranging from pale or grayish blue to a deep blue, named for the color of powdered smalt that was formerly used in washing clothes as a bluing agent and in coloring porcelain; the smalt powder is deep blue, and the smalt diluted in water is a pale blue color.